from django.db import models

# Create your models here.
from django.utils import timezone 
from django.contrib.auth.models import User 
from	django.db.models.query	import	QuerySet
from django.urls import reverse
# 其他导入代码无修改，此处已经省略
from taggit.managers import TaggableManager

class PublishedManager(models.Manager):
    def get_queryset(self) -> QuerySet:
      return super(PublishedManager,
 self).get_queryset().filter(status='published')

class Post(models.Model): 
  objects = models.Manager() 
  published = PublishedManager()
  # 增加tags字段 
  tags = TaggableManager() 
  STATUS_CHOICES = ( 
    ('draft', 'Draft'), 
      ('published', 'Published') 
)
  title = models.CharField(max_length=250) 
  body = models.TextField() 
  slug = models.SlugField(max_length=250, unique_for_date='publish') 
  author = models.ForeignKey(User, on_delete=models.CASCADE, 
related_name='author') 
  publish = models.DateTimeField(default=timezone.now) 
  created = models.DateTimeField(auto_now_add=True) 
  updated = models.DateTimeField(auto_now=True) 
  status = models.CharField(max_length=10, choices=STATUS_CHOICES, 
default='draft') 

  class Meta: 
    ordering = ('-publish',) 
  def __str__(self): 
    return self.title
  
  def get_absolute_url(self): 
    return reverse('blog:post_detail', args=[self.publish.year, 
                   self.publish.month, self.publish.day, self.slug])

class Comment(models.Model): 
    post = models.ForeignKey(Post, 
    on_delete=models.CASCADE, 
    related_name='comments') 
    name = models.CharField(max_length=80) 
    email = models.EmailField() 
    body = models.TextField() 
    created = models.DateTimeField(auto_now_add=True) 
    updated = models.DateTimeField(auto_now=True) 
    active = models.BooleanField(default=True) 
    class Meta: 
      ordering = ('created',) 

    def __str__(self): 
      return f'Comment by {self.name} on {self.post}'